<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 300px;
            height: 200px;
            /* border-width:  边框的粗细。一般情况下都用px作为单位; */
            border-width: 5px;
            /* border-style: 边框的样式 solid 实线边框  dashed 虚线边框   dotted 点线边框 */
            border-style: solid;
            /* border-style: dashed; */
            /* border-style: dotted; */

            /* border-color: 边框颜色 */
            border-color: rgb(16, 77, 130);

            /* 边框简写  没有顺序*/
            border: 1px solid red;  

            /* 边框分开写法 */
            border-top: 5px solid pink;
            border-right: 10px dashed red;
        }
    </style>
</head>
<body>
    <div>

    </div>
</body>
</html>